Ductile Iron Blind Flange
Ductile Iron Blind Flange is known among field engineers as either a blank flange or pipe‑end cap. It creates reliable sealing for endpoints on pressurized piping systems. In real‑world projects, this fitting closes pipe branches and valve outlets, completely cutting the flow of water, sewage and other neutral liquids.
Unlike regular flanges, this part features no central bore. Its solid‑body construction builds a sturdy barrier that can withstand strong backpressure without failure. Project teams frequently deploy this product for water‑treatment facilities and irrigation networks. It helps isolate certain pipeline sections, whether you need to carry out maintenance or reserve space for future system expansion.
Main Technical data
| Product Name | Ductile Iron Blind Flange (Blank Flange) |
| Brand | Keylion® |
| Nominal Diameter | DN40 - DN2000 (Custom sizes available) |
| Material | Ductile Iron |
| Pressure Rating | PN10/PN16/PN25/PN40 |
| Application Media | Potable Water, Sewage, Wastewater, Neutral Liquids, and Firefighting Systems |
| Working Temperature | 0°C to 70°C |
Common customer questions
Which industries usually order these blind flanges?
A large share of our orders go to municipal water departments and fire‑protection contractors. This component is widely applied when building urban drinking‑water pipelines or big‑size industrial sprinkler networks, acting as an end cap to close pipeline runs. That said, we would not recommend this ductile iron version for heavy‑duty chemical sites handling strong acids. For such harsh working conditions, you should go for stainless steel or specially lined fittings instead.
Where do you fit this inside a water‑treatment facility?
You will find them mounted on pump header ends, or closing branch pipe points reserved for future pump installations. They bolt straight to gate valve or check valve flanges to fully shut off flow. Quite a few plant designers fit them to maintain system pressure, while they carry out construction for additional filter modules down the line.
Will it stand up to high‑temperature media?
Not really. This blind flange is engineered mainly for water and sewage pipelines. Its fusion‑bonded epoxy coating can only sustain temperatures up to roughly 70°C. Hot boiling water or steam will make the coating bubble and peel off, and EPDM gaskets will break down quickly. Stick to ambient‑temperature or chilled water service for this product.
What about routine upkeep work?
Once properly bolted down, this is a passive fitting that requires very little hands‑on care to hold working pressure. We advise operators to give it a quick visual check in yearly site surveys. Watch out for moisture seepage around bolt holes and obvious corrosion marks. If the blue epoxy surface gets scratched during on‑site repairs, touch up the damaged spot with epoxy paint to stop iron rust from spreading.
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